I&#39;m trying to create a semi-transparent demo screen that is launched only when a user first installs my application.  Here&#39;s an example from the Pulse News app:

**Galaxy Nexus**

![Example screenshot from Pulse News on Galaxy Nexus][1]

**Nexus One**

![enter image description here][2]

Instead of a &#39;tap-to-dismiss&#39; feature, I want the user to be able to swipe through a couple of such transparent demo pages.  

For my first attempt, I modified a sample from the [ViewPagerIndicator][3] library.  I used semi-transparent PNGs in ImageViews inside each of the view pager&#39;s fragments.  I then launched this as a &#39;demo activity&#39; in the onCreate method of my &#39;main activity&#39;.  

Problem: The &#39;main activity&#39;  could not be seen in the background - instead it was just black.  I tried the solutions [here][4], but that didn&#39;t fix the problem.

Is there a better approach to creating something like this, or am I on the right track?  

I also had another related question which depends on how this is implemented.  I&#39;m trying to overlay text and arrows such that they point at particular UI components in the background.  By using a PNG that has the text and arrows, it&#39;s likely that it will not scale properly on different devices.  I.e., the arrows may not necessarily point to the correct UI component in the background.  Is there a way to tackle this problem as well?

Thanks!

Here&#39;s my code for the first attempt:

**DemoActivity.java**

    public class DemoActivity extends FragmentActivity {
        DemoFragmentAdapter mAdapter;
        ViewPager mPager;
        PageIndicator mIndicator;
    	
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.demo_activity);
    
            mAdapter = new DemoFragmentAdapter(getSupportFragmentManager());
    
            mPager = (ViewPager)findViewById(R.id.pager);
            mPager.setAdapter(mAdapter);
            //mPager.setAlpha(0);
    
            UnderlinePageIndicator indicator = (UnderlinePageIndicator)findViewById(R.id.indicator);
            indicator.setViewPager(mPager);
            indicator.setFades(false);
            mIndicator = indicator;
        }
    
    }

**DemoFragmentAdapter.java**

    class DemoFragmentAdapter extends FragmentPagerAdapter {
        protected static final int[] CONTENT = new int[] { R.drawable.demo1, R.drawable.demo2, R.drawable.demo3, R.drawable.demo4};
    
        private int mCount = CONTENT.length;
    
        public DemoFragmentAdapter(FragmentManager fm) {
            super(fm);
        }
    
        @Override
        public Fragment getItem(int position) {
            return DemoFragment.newInstance(CONTENT[position % CONTENT.length]);
        }
    
        @Override
        public int getCount() {
            return mCount;
        }
    
        public void setCount(int count) {
            if (count &gt; 0 &amp;&amp; count &lt;= 10) {
                mCount = count;
                notifyDataSetChanged();
            }
        } }


**DemoFragment.java**

    public final class DemoFragment extends Fragment {
        private static final String KEY_CONTENT = &quot;TestFragment:Content&quot;;
    
        public static DemoFragment newInstance(int content) {
            DemoFragment fragment = new DemoFragment();
            fragment.mContent = content;
            return fragment;
        }
    
        private int mContent;
    
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
    
            if ((savedInstanceState != null) &amp;&amp; savedInstanceState.containsKey(KEY_CONTENT)) {
                mContent = savedInstanceState.getInt(KEY_CONTENT);
            }
        }
    
        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        	
            ImageView image = new ImageView(getActivity());
            image.setBackgroundResource(mContent);
    
            LinearLayout layout = new LinearLayout(getActivity());
            layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
            layout.setGravity(Gravity.CENTER);
            layout.addView(image);
        	
            return layout;
        }
    
        @Override
        public void onSaveInstanceState(Bundle outState) {
            super.onSaveInstanceState(outState);
            outState.putInt(KEY_CONTENT, mContent);
        }
    }


  [1]: http://i.stack.imgur.com/P3kzh.png
  [2]: http://i.stack.imgur.com/Jji5T.png
  [3]: http://viewpagerindicator.com/
  [4]: https://stackoverflow.com/questions/2176922/how-to-create-transparent-activity-in-android

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How do you create a transparent demo screen for an Android app?